PV multi-level based Grid

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Shoubi Razan
Shashtare Zenat
Nofal Yasmeen
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PHOTOVOLTAIC (PV) power supplied to the utility grid is gaining more and more visibility, while the world’s power demand is increasing. Solid state inverters have been shown to be the enabling technology for putting Photovoltic PV system into the grid. 2-level inverters are used to convert the DC voltage optained from the Photovoltic system to AC voltage fed to the utility. However, the use of 2-level inverters causes an increase in the Total Harmonic Distortion (THD) and other Power quality issues due to the harmonics injected by the such inverters. Increasing attention has been paid to multilevel dc/ac inverters in recent years to obtain output voltage of high quality. One of the more flexible topology is the asymmetric cascaded H-Bridge multilevel inverter, which will be employed in the project to improve the quality of the output voltage by reducing the harmonic contents. The project consists of two modules: power circuit and control circuit. The power circuit consists of two H_bridges forming an eight- level inverter. The ratio between DC voltage of the two H-Bridges will be 1:3. This will help to generate maximum number of levels and generate output near sinusoidal. The control circuit include the using of a microcontroller and current and voltage sensors to generate PWM signal to H-bridges and control the injection of real and reactive power inject to the grid. The whole structure of the project will be shown in Figure 1 ( Attached is a file showing the figure) . Experimental and simulation results using matlab /simulink will be presented to show the improving of the power quality using the multilevel inverter.